drivers/mmc/sandbox_mmc.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (c) 2015 Google, Inc
   4  * Written by Simon Glass <sjg@chromium.org>
   5  */
   6
   7 #include <common.h>
   8 #include <dm.h>
   9 #include <errno.h>
  10 #include <fdtdec.h>
  11 #include <mmc.h>
  12 #include <asm/test.h>
  13
  14 struct sandbox_mmc_plat {
  15         struct mmc_config cfg;
  16         struct mmc mmc;
  17 };
  18
  19 /**
  20  * sandbox_mmc_send_cmd() - Emulate SD commands
  21  *
  22  * This emulate an SD card version 2. Single-block reads result in zero data.
  23  * Multiple-block reads return a test string.
  24  */
  25 static int sandbox_mmc_send_cmd(struct udevice *dev, struct mmc_cmd *cmd,
  26                                 struct mmc_data *data)
  27 {
  28         switch (cmd->cmdidx) {
  29         case MMC_CMD_ALL_SEND_CID:
  30                 memset(cmd->response, '\0', sizeof(cmd->response));
  31                 break;
  32         case SD_CMD_SEND_RELATIVE_ADDR:
  33                 cmd->response[0] = 0 << 16; /* mmc->rca */
  34         case MMC_CMD_GO_IDLE_STATE:
  35                 break;
  36         case SD_CMD_SEND_IF_COND:
  37                 cmd->response[0] = 0xaa;
  38                 break;
  39         case MMC_CMD_SEND_STATUS:
  40                 cmd->response[0] = MMC_STATUS_RDY_FOR_DATA;
  41                 break;
  42         case MMC_CMD_SELECT_CARD:
  43                 break;
  44         case MMC_CMD_SEND_CSD:
  45                 cmd->response[0] = 0;
  46                 cmd->response[1] = 10 << 16;    /* 1 << block_len */
  47                 cmd->response[2] = 0;
  48                 cmd->response[3] = 0;
  49                 break;
  50         case SD_CMD_SWITCH_FUNC: {
  51                 if (!data)
  52                         break;
  53                 u32 *resp = (u32 *)data->dest;
  54                 resp[3] = 0;
  55                 resp[7] = cpu_to_be32(SD_HIGHSPEED_BUSY);
  56                 if ((cmd->cmdarg & 0xF) == UHS_SDR12_BUS_SPEED)
  57                         resp[4] = (cmd->cmdarg & 0xF) << 24;
  58                 break;
  59         }
  60         case MMC_CMD_READ_SINGLE_BLOCK:
  61                 memset(data->dest, '\0', data->blocksize);
  62                 break;
  63         case MMC_CMD_READ_MULTIPLE_BLOCK:
  64                 strcpy(data->dest, "this is a test");
  65                 break;
  66         case MMC_CMD_STOP_TRANSMISSION:
  67                 break;
  68         case SD_CMD_APP_SEND_OP_COND:
  69                 cmd->response[0] = OCR_BUSY | OCR_HCS;
  70                 cmd->response[1] = 0;
  71                 cmd->response[2] = 0;
  72                 break;
  73         case MMC_CMD_APP_CMD:
  74                 break;
  75         case MMC_CMD_SET_BLOCKLEN:
  76                 debug("block len %d\n", cmd->cmdarg);
  77                 break;
  78         case SD_CMD_APP_SEND_SCR: {
  79                 u32 *scr = (u32 *)data->dest;
  80
  81                 scr[0] = cpu_to_be32(2 << 24 | 1 << 15);  /* SD version 3 */
  82                 break;
  83         }
  84         default:
  85                 debug("%s: Unknown command %d\n", __func__, cmd->cmdidx);
  86                 break;
  87         }
  88
  89         return 0;
  90 }
  91
  92 static int sandbox_mmc_set_ios(struct udevice *dev)
  93 {
  94         return 0;
  95 }
  96
  97 static int sandbox_mmc_get_cd(struct udevice *dev)
  98 {
  99         return 1;
 100 }
 101
 102 static const struct dm_mmc_ops sandbox_mmc_ops = {
 103         .send_cmd = sandbox_mmc_send_cmd,
 104         .set_ios = sandbox_mmc_set_ios,
 105         .get_cd = sandbox_mmc_get_cd,
 106 };
 107
 108 int sandbox_mmc_probe(struct udevice *dev)
 109 {
 110         struct sandbox_mmc_plat *plat = dev_get_platdata(dev);
 111
 112         return mmc_init(&plat->mmc);
 113 }
 114
 115 int sandbox_mmc_bind(struct udevice *dev)
 116 {
 117         struct sandbox_mmc_plat *plat = dev_get_platdata(dev);
 118         struct mmc_config *cfg = &plat->cfg;
 119
 120         cfg->name = dev->name;
 121         cfg->host_caps = MMC_MODE_HS_52MHz | MMC_MODE_HS | MMC_MODE_8BIT;
 122         cfg->voltages = MMC_VDD_165_195 | MMC_VDD_32_33 | MMC_VDD_33_34;
 123         cfg->f_min = 1000000;
 124         cfg->f_max = 52000000;
 125         cfg->b_max = U32_MAX;
 126
 127         return mmc_bind(dev, &plat->mmc, cfg);
 128 }
 129
 130 int sandbox_mmc_unbind(struct udevice *dev)
 131 {
 132         mmc_unbind(dev);
 133
 134         return 0;
 135 }
 136
 137 static const struct udevice_id sandbox_mmc_ids[] = {
 138         { .compatible = "sandbox,mmc" },
 139         { }
 140 };
 141
 142 U_BOOT_DRIVER(mmc_sandbox) = {
 143         .name           = "mmc_sandbox",
 144         .id             = UCLASS_MMC,
 145         .of_match       = sandbox_mmc_ids,
 146         .ops            = &sandbox_mmc_ops,
 147         .bind           = sandbox_mmc_bind,
 148         .unbind         = sandbox_mmc_unbind,
 149         .probe          = sandbox_mmc_probe,
 150         .platdata_auto_alloc_size = sizeof(struct sandbox_mmc_plat),
 151 };